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Ch8 Vocab (Askeland)
Vocabulary Study Guide for MEE312
12
Mechanical Engineering
Undergraduate 3
03/06/2015

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Term
Annealing
Definition
in the context of a metallic material, a heat treatment used to eliminate part or all of the effects of cold working
Term
Cold Working
Definition
deformation of a metal below the recyrstallization temperature, the number of dislocations in the metal increases causing the metal to be strengthened as the shape is changed
Term
Drawing
Definition
a deformation processing technique in which a material is pushed through an opening in a die (ex to form wire)
Term
Extrustion
Definition
deformation processing technique in which a material is pushed through an opening in a die
Term
Frank-Read Source
Definition
a pinned dislocation that under an applied stress produces additional dislocation, this mechanismis at least partially responsible for strain hardening
Term
Hot Working
Definition
deformation of a metal above its recrystallization temperature, only the shape of the metal changes, the strength remains relatively unchanged
Term
Polygonized Subgrain Structure
Definition
a subgrain structure produced in the early stages of annealing, made up of a network of dislocations rearranged during heating
Term
Recovery
Definition
a low temperature annealing heat treatment designed to eliminate residual stresses introduced during deformation without reducing the strength of the cold worked material, same as stress relief anneal
Term
Recrystallization
Definition
a medium temperature annealing heat treatment designed to eliminate all of the effects of strain hardening produced during cold working, nucleation of new grains that eliminates most of the dislocations
Term
Residual Stresses
Definition
stresses introduced in a material during processing, can orginate in cold working or differential thermal expansion and contraction
Term
Strain Hardening
Definition
strengthening of a material by increasing the number of dislocations by deformation, also known as "work hardening"
Term
Stress Relief Anneal
Definition
the recovery stage of the annealing heat treatment during which residual stresses are relieved without reducing the mechanical properties of the metal
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